Amazon.com : Rotring 600 Series Mechanical Pencil, 0.7mm, Black Body (502607) : Office Products
Rotring 600 0.5/0.7mm Mechanical Pencil Various Colors Metal Automatic Drawing Pencil Design Stationery School Office Supplies - Mechanical Pencils - AliExpress
Rotring 600 Automatic Pencil Limited 0.5 mm & 0.7 mm Metal Rod Professional Sketch Drawing Mechanical Pencils 1Pcs/Lot|Mechanical Pencils| - AliExpress
201 Rotring 600 Drafting Mechanical Pencil 0.7 mm NOS Made in Germany or Japan | eBay
ULTRA RARE Rotring 600 - LEVENGER mechanical pencil 0.7mm black from 1990 | eBay